1cbbc66fa4
Pre-existing uncommitted first-party work, surfaced by the first-party integrity gate. Committing rather than reverting: this code exists nowhere but this project, so a revert would destroy it outright, and it is coherent and self-consistent -- a DMI entry for the board plus a test in toml_loader.rs that parses the REAL 50-system.toml and asserts the entry matches while LG entries do not. The quirk carries no flags by design; its comment states it is a bare-metal anchor so future board-specific quirks can be added precisely. Related to the Ryzen 7000 / X670E work in .omo/plans/ryzen-7000-x670e-compat.md. Not authored in this session -- committed here because it blocked every build and the gate's guidance is to commit or revert, and reverting irreplaceable work is the wrong call.